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Criterion Dynamax 8 question

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#26 Bomber Bob

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Posted 07 February 2020 - 09:18 AM

My 1974 DX8 gray / gray was a beautiful Display Scope:

 

DX8 on GP (Complete) S99.jpg

 

But it was very very limited in actual use:  low to medium powers, faint fuzzies (nebulae & galaxies), and the Moon.  That's it.

 

My $100 1980s Meade 826 is a fantastic all-rounder on every object type.  And, it's much lighter, and much easier to deal with.  But... it ain't as pretty...


 

#27 highfnum

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Posted 07 February 2020 - 10:36 AM

bomberbob you still own it?

ok for medium resolution deep sky 

m13 

 

Attached Thumbnails

  • dy8a.jpg

Edited by highfnum, 07 February 2020 - 10:41 AM.

 

#28 Bomber Bob

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Posted 07 February 2020 - 11:43 AM

I sold my DX8 years ago.  The new owner keeps it on display; and, when the seeing permits, uses it on DSOs only, so he's happy with it.


 

#29 highfnum

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Posted 07 February 2020 - 12:43 PM

ok thats fair

he understands limits and uses 


 

#30 Chuck Hards

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Posted 07 February 2020 - 12:53 PM

Tim and I each have an early one that you can push close to 100X, but an 8-inch scope should be able to hit around 400X.   

 

My later model blue one has a worse image than it's finder.  Not usable at all.


 

#31 NVDW

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Posted 07 February 2020 - 12:54 PM

I'll sell my Meade to fund this one :)

Verstuurd vanaf mijn MI 8 met Tapatalk
 

#32 bobhen

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Posted 07 February 2020 - 01:26 PM

Just looked at a few of my observing notes using my 1978 DX8 from the Philadelphia suburbs. I don’t have many notes from back then and I’m not listing all he descriptions or the sky conditions here, they were of course variable. But the list gives a taste of what “my particular” DX8 could do.

 

Keep in mind I was using a “pretty average” diagonal at the time. The sky was darker back then as well. So at least my DX8 was far from a trash scope or showed “nothing” but mush.  However, my next scope was an Astro-Physics 6” refractor and that scope showed me what excellent optics could do on the planets.

 

Moon: first quarter: best at 225x with some higher power views
M13: spectacular at 300x
M27: great at 100-150x with an UHC filter
M8: 100x UHC filter: dark lane and much nebulosity
Veil Nebula: 60x UHC filter
M2 resolved and excellent at 300x
M104 Bright center, prominent arms and slash 100 and 225x
M31, 32 and 110
Saturn best at 225x and Venus best at 150x
Ring Nebula Sharp at 100x softer at 200x UHC filter

 

Bob


 

#33 Terra Nova

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Posted 07 February 2020 - 03:26 PM

My 1974 DX8 gray / gray was a beautiful Display Scope:

 

attachicon.gifDX8 on GP (Complete) S99.jpg

 

But it was very very limited in actual use:  low to medium powers, faint fuzzies (nebulae & galaxies), and the Moon.  That's it.

 

My $100 1980s Meade 826 is a fantastic all-rounder on every object type.  And, it's much lighter, and much easier to deal with.  But... it ain't as pretty...

Display Scope = Dust Catcher = Floor Obstacle = Waste of Space. It’s not art that can be hung on the wall and it’s not sculpture that can remain in the garden. It’s not functional furniture either. It’s just tied up capital taking up space. I’m done with the concept as well as the practice. If it doesn’t get used and can’t easily be stored when not in use, in my house, it’s gone! I’m so glad that I have cut way back (and am still cutting). 


 

#34 Chuck Hards

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Posted 07 February 2020 - 05:10 PM

Lamp!  


 

#35 tim53

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Posted 07 February 2020 - 05:33 PM

I have to say, though, that the one complete one I got from Chuck isn't all bad.  It did pretty decently on Jupiter up above 100x, though I'm not remembering what it was (I wrote it down somewhere).  Also, the mechanicals aren't to be sneezed at.  I really liked the focusing action on it.  Large knob and very smooth motion made it easy and fun to focus, even though I was using the tabletop legs and a flimsy steel folding table in the field.

 

If I wasn't so busy at work...  but someday, I'll get to play with the corrector, using the one in the lesser quality of the two to experiment with.


 

#36 Bomber Bob

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Posted 07 February 2020 - 05:47 PM

One night with excellent seeing, I got my DX8 up to 185x on Jupiter without it getting too soft.  But... that was long before I got my outstanding Meade 826, or my Vixen VMC200L, and saw what a high-quality 8" reflector can deliver...

 

I agree with Terra in that a Display Scope should be functional, too.  Both my Mogey 3 & Tinsley 6 perform well to very well for their types & apertures.  That's what galled me about my DX8:  The mechanical & functional traits were outstanding -- tracked better than my C5 Astro, and close to my Questar -- but at its primary function, it stank on ice for everything except DSOs...

 

Even at half the aperture, my Mizar 100mm F10 Newt whacked it as an all-purpose scope -- and was almost as pretty on display, too.


 

#37 highfnum

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Posted 07 February 2020 - 06:08 PM

BB said "tracked better than my C5 Astro, and close to my Questar"

ill second that and mine still does after 40+ years

you guys saw what my rv-6 and dyna 4 can do 

if only I go back in time and warn them 

 

that dumb butt  corrector  put that company under

I live about 70 miles from where they were made in CT (or at least put together)

makes a man angry!


 

#38 Chuck Hards

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Posted 07 February 2020 - 06:20 PM

Even the best examples put up images no better than a 60mm, so it really is a waste of aperture.  I was an apologist for this scope for too long.   Everything else about the system is very good including the tracking and slow-motions.  My blue and light grey example is pristine and I have most of the accessories.  It really is a very well-designed telescope.  That corrector is the only problem.

 

I'm going to dig out my older grey one, the match to Tim's, now that I have a Golden Pyramid for it, as well.  When it warms up I'll set them up side-by-side and we'll see what shakes out.

 

DmX001.jpg

 

DmX011.jpg

 

DmX004.jpg

 

DmX007.jpg

 

DmX009.jpg

 

DmX010.jpg

 

 

Hey, I'm still collecting accessories for it, so even though it doesn't perform, it's not going anywhere.  Last year I picked up a set of the setting circle illuminators for it.  I need to dig those out as well.


 

#39 clamchip

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Posted 07 February 2020 - 07:01 PM

I wonder if these people can help.

They fab Celestron and Meade correctors, maybe if they knew the

Dynamax situation they might be interested:

https://www.toscanop...corrector-plate

 

Robert


 

#40 Ben H

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Posted 07 February 2020 - 07:05 PM

I wonder if these people can help.

They fab Celestron and Meade correctors, maybe if they knew the

Dynamax situation they might be interested:

https://www.toscanop...corrector-plate

 

Robert

Would be hard for me to justify 360+ Euros for one


 

#41 CHASLX200

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Posted 07 February 2020 - 07:06 PM

Maybe slap a corrector from a C8 and see if it works. If it will fit.


 

#42 highfnum

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Posted 07 February 2020 - 07:09 PM

no tried that

dont work cause different fl


 

#43 Stevegeo

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Posted 07 February 2020 - 07:31 PM

Recently i picked up a D8 after watching it closely on a local classified ad for some time.  I was initially interested in this for it's tripod only, a golden, which is a very good tripod . Well built, solid sturdy...

After getting this home (cheap) , I decided this would be a good scope for outreach/public events and not worry if something happened to it. The condition I would place this D8 as excellent, no dings, scuffs , or scratches ... The primary is clean and fungus free. Secondary ditto . Mount movement is smooth and focus easy in/out .

I set this up and spotted to a cell tower 5miles away threw in a plossel 20mm and found the image very acceptable. Though the finderscope a bit lacking...going to a 12mm eyepiece the image a bit fuzzy as I expected. comparing to my C8 made around the same time . Yes I know it's not a super performer , and the brand has had problems , it reputation not the best.

It is a good looking scope and as the weather gets better I will learn more as I take it out.

IMG_20200202_172723.jpg.jpg

 

Stevegeo area 3751 otisco lake NY 


 

#44 Terra Nova

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Posted 07 February 2020 - 08:08 PM

It sure is a nice looking scope Steve!


 

#45 starman876

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Posted 07 February 2020 - 09:18 PM

I had one long enough to sell it. Do not remember actually using it.  Someone down under wanted it for a display.   


 

#46 G-Tower

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Posted 07 February 2020 - 09:34 PM

This is like the movie Groundhog Day...


 

#47 highfnum

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Posted 07 February 2020 - 09:57 PM

but strange enough every year I get request from members of my club 

to bring out the dynamax 

sometimes a bad rep is as good as a good rep to get attention 


 

#48 starman876

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Posted 07 February 2020 - 10:15 PM

Everyone wants to look through a legend


 

#49 deepwoods1

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Posted 08 February 2020 - 01:26 AM

My DX6 will be displayed at NEAF and I won’t even charge for you to touch it!


 

#50 davidc135

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Posted 08 February 2020 - 04:48 AM

It's got the tripod and accessories. 600 euros is too much but you should be able to resell at 400 if it turns out hopeless which is likely.

 

Or discover a way to refigure/make a good corrector. And that's just as tricky as finding a good DX-8 in the first place.  David


Edited by davidc135, 08 February 2020 - 04:49 AM.

 


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